krystle campbell, the 29-year-old at the finish line clearing on a friend. and later this evening, boston university will hold a memorial service for lu lingzi, the 23-year-old graduate, the student from china also killed in the blast. meanwhile as crews clean up the crime scene today, new questions about how the fbi interrogated tamerlan tsarnaev before the attacks. >> why didn't the fbi follow up on that? you combine the first interrogation, the first examination plus the subsequent act. when somebody is brought to your attention, you investigate and find nothing and then he carries out murders, you wonder, didn't you miss something in the investigation? >> and today, our investigative team uncovered new details about the suspect's weapons. tamerlan and dzhokhar both carried illegal guns. neither had proper permits nor petitions and dzhokhar tsarnaev was under age. within the last hour the white house explained why the surviving suspect will go through the criminal system. >> he will not be treated as an enemy combatant. we will prosecute this terrorist th